Electric heating – Microwave heating – Enclosed cavity structure
Patent
1993-06-01
1995-02-28
Reynolds, Bruce A.
Electric heating
Microwave heating
Enclosed cavity structure
H05B 664
Patent
active
053939611
ABSTRACT:
In a microwave heating device, a propeller fan is mounted on a drive shaft of a motor that in vertically positioned parts of a high frequency power supply unit are arranged in the order of a power control semiconductor device and a high-voltage transformer along the direction of revolution of the propeller fan. The motor is secured to a support member formed by a motor cover attached to the casing of the propeller fan. The fan and high frequency power supply unit are mounted to a first frame and a second frame, both of which are bent and connected at a connecting portion and fixed in an approximately "L" shape, while an airflow path is defined by a first guide wall and a second guide wall to cool the parts of the high frequency power supply unit. An airflow path is formed by a plurality of guide walls provided on the two frames, and a communicating hole is provided in proximity to the connecting portion of the two frames. The propeller fan is so arranged as to revolve at a low r.p.m. after stopping the microwave heating.
REFERENCES:
patent: 4100463 (1978-07-01), Sugie
patent: 4546225 (1985-10-01), McCammon
patent: 4623771 (1986-11-01), Sakino
patent: 4743728 (1988-05-01), Nagafusa et al.
patent: 4812617 (1989-03-01), Takeuji
Mihara Makoto
Morikawa Hisashi
Sakai Shin-ichi
Umekage Yasuhiro
Watanabe Yoshiaki
Matsushita Electric - Industrial Co., Ltd.
Reynolds Bruce A.
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